DIH multithreading sometimes throws NPE
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Key: SOLR-1757
URL: https://issues.apache.org/jira/browse/SOLR-1757
Project: Solr
Issue Type: Bug
Components: contrib - DataImportHandler
Affects Versions: 1.4
Environment: tomcat 6.0.x, jdk 1.6.x on windows xp 32bit
Reporter: Michael Henson
When the "threads" attribute is set on a root entity in the DIH's
data-config.xml, the multithreading code sometimes throws a
NullPointerException after the full-index command is given.
I haven't yet been able to figure out exactly which reference holds the null or
why, but it does happen consistently with the same backtrace.
My configuration is:
1. Multi-core Solr under tomcat
2. Using JdbcDataSource and the default SqlEntityProcessor
To reproduce:
1. Add the attribute threads="2" to the root entity declaration in
data-config.xml
2. Send the full-import command either directly to
.../core/dataimport?command=full-import or through the /admin/dataimport.jsp
control panel.
3. Wait for the NPE to show up in the logs/console
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